SAMPLE PERFORMANCE SPECIFICATIONS
SPRAY APPLIED ACOUSTICAL PLASTER
ACOUSTEMENT PLASTER 20
PART 1 - GENERAL
1.01 WORK INCLUDED
A. Extent of sprayed on decorative/acoustical insulation is indicated on drawings.
1.02 QUALITY ASSURANCE
A. Provide Gypsum Plaster-Vermiculite material which has been tested to and achieved following values:
AUTHORITY PROPERTY VALUE
ASTM E605 Density 22 Lbs./Cu.Ft.
ASTM E761-86 Compressive 30 PSI
ASTM E736-86 Bond 670 Lbs./Sq.Ft.
ASTM E-84-87 Surface Burning Characteristics 0 Flame Spread
0 Smoke Developed
ASTM C423-84A Sound 0.65 NRC @ 1" Thick
Absorption 0.50 NRC @ 1/2" Thick
University of Pittsburgh Toxicity Test Toxicity LC(50) > 300 Grams
ASTM E 136 Combustibility Non-Combustible
B. Provide testing results and procedures which have been certified by Cedar Knolls Acoustical Labs, or other
accredited independent testing laboratories. Peak thickness of test samples must be determined and reported by
acoustical laboratory. Nominal thicknesses are not acceptable unless peak thicknesses are also reported.
1. NRC not less than 0.65 at 1 inch thickness and coefficient not less than 0.40, + or - 0.03, at 250 Hz. Conduct
testing on solid backing with no air gap.
C. Installer: licensed by manufacturer.
D. Control Sample: Prior to installation of final coat, apply an area of 50 sq. ft. in presence of architect, for approval of
finish texture, as selected from samples.
A. Submit manufacturer's installation instructions, test data substantiating compliance with quality assurance.
B. Submit 12 inch square sample of sprayed on insulation showing texture variations for approval. Resubmit as
required until approved. All samples must be certified by manufacturer that they are representative of the texture
which was acoustically tested in supporting acoustical test reports.
C. Submit test reports from all suppliers showing material to be 100% free of asbestos, mineral fibers, polystyrene and
D. Submit certification of applicator licensing.
E. Submit acoustical test data for specified finish.
1.04 MATERIAL HANDLING
A. Keep material dry until ready for use.
A. Manufacturer shall warrant the material to be supplied, agreeing to repair/replace that which has cracked, flaked,
dusted excessively, peeled or fallen from substrate, or otherwise deteriorated to a condition where it would not
perform effectively as intended for a sound absorbent purpose; due to defective materials and not due to abuse,
improper maintenance, unforeseeable ambient exposures, or other causes beyond anticipated conditions by
manufacturer. The warranty period will be 10 years from date of substantial completion.
PART 2 – PRODUCTS
A. Materials shall be Acoustement Plaster 20 manufactured by PYROK, Inc., Mamaroneck, N.Y. (914) 777-7070,
B. Color shall be __________ or selected by the architect or engineer.
C. Texture shall be (Standard Texture) or (Semi-Smooth troweled finish).
D. Thickness shall be ___".
PART 3 – EXECUTION
3.01 INSPECTION AND PREPARATION
A. Examine all substrate and conditions.
B. Assure substrate is free of oil, grease, dirt, paint, or other matter which would impair bond or install metal lath as
recommended by the manufacturer.
C. Do not proceed until said substrate and conditions are acceptable.
D. Prepare substrate by filling voids and cracks and offsets, remove projections that result in telegraphing presence of
E. Prime substrate with primer or bonding agent as recommended by the manufacturer.
F. Do not apply insulation material when temperature is below 44 degrees F (ambient), or substrate is below 40
G. Mask all adjoining surfaces in order to minimize damage from overspray.
H. Provide ventilation if required, and avoid excess drying rates.
I. Provide tarps or temporary enclosures as necessary to confine operations.
J. Perform all patching and repairing of insulation required to be done due to cutting, etc., by other trades.
A. Apply in accordance with manufacturer's printed instructions using any rotary-stator plastering pump or other spray
equipment approved by the manufacturer.
B. Install to thickness indicated or thickness required to achieve NRC specified.
C. Ensure that texture and color are all as per control sample.
D. Utilize Acoustement Plaster 40 for initial spray coats as recommended by the manufacturer.
3.03 CLEANING AND PATCHING
A. Remove overspray and fall out materials immediately upon completion of the work in each area. Clean surfaces to
remove evidence of soiling. Repair or replace damaged work surfaces to acceptable conditions.
B. Coordinate work with other work, to minimize possibility of damage to insulation resulting from performance of
subsequent work. As other units of work are completed in each area, patch damaged areas or surfaces of insulation
by overspraying to match original installations, or by patching procedures as required to provide acceptable results.